Check control plane topology

[slintes]

Why we need this PR

There might be clusters which handle fencing on their own in future.
Disallow NHC configs in these cases, in order to prevent fencing conflicts.

Changes made

• Added control plane topology check to cluster capabilities
• Use capabilities in admission webhook

Which issue(s) this PR fixes

ECOPROJECT-2395

Test plan

• added unit test for admission webhook
• existing e2e tests ensure we don't add regression

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: slintes

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[slintes]

/test 4.17-openshift-e2e

[mshitrit]

/lgtm

[slintes]

/test 4.17-openshift-e2e

[slintes]

works now after fixing RBAC:

• green on k8s
• green for HA topology: 2024-12-05T20:08:03.894296519Z INFO setup supported control plane topology {"topology": "HighlyAvailable"}

[clobrano]

/lgtm

[slintes]

/retest

[slintes]

/retest

[slintes]

/retest

[slintes]

all kind of different errors on 4.18, let's keep an eye on it in #352 ...

/override ci/prow/4.18-openshift-e2e

[openshift-ci]

@slintes: Overrode contexts on behalf of slintes: ci/prow/4.18-openshift-e2e

In response to this:

all kind of different errors on 4.18, let's keep an eye on it in #352 ...

/override ci/prow/4.18-openshift-e2e

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